JP2012036920A - Refrigerant on-off valve of air conditioner and method for connecting pipes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for connecting pipes of a refrigerant on-off valve of an air conditioner capable of intending to reduce cost and to enhance the reliability.SOLUTION: The method is provided for connecting the pipes of the refrigerant on-off valve 1 of the air conditioner. The on-off valve includes: a body 2, which has a valve rod receiving port 3, a first refrigerant port 4 arranged coaxially with the valve rod receiving port 3 while being in communication with the same, a valve seat 7 arranged in one end of the first refrigerant port 4 while enlarging the diameter, and a second refrigerant port 5 branched from between the valve rod receiving port 3 and the first refrigerant port 4, and which forms a refrigerant flowing channel 11 between the first refrigerant port 4 and the second refrigerant port 5; and a valve rod 20 the distal end of which is threadedly inserted into the valve rod receiving port 3 comes into contact with and leaves from the valve seat 7 to thereby open and close the refrigerant flowing channel 11. The abutment surfaces of the distal end of the valve rod 20 and the valve seat 7 themselves are formed by the slopes 20c, 7a, the distal end of the refrigerant pipe 25 inserted into the first refrigerant port 4 is held by the distal end of the valve rod 20 and the valve seat 7 and machined into a flare shape.

Description

  The present invention relates to a refrigerant on-off valve that connects a refrigerant pipe of an air conditioner to open and close a refrigerant flow path and a pipe connection method thereof.

  A conventional refrigerant on-off valve of an air conditioner is disclosed in Patent Document 1. The refrigerant on-off valve of this air conditioner is a three-way valve, and includes a main body and a valve rod. The main body has a substantially cross-shaped passage inside, and a valve rod receiving port, a first refrigerant port, a second refrigerant port, and a service port are opened.

  A valve stem is screwed into the valve stem receiving port. The first refrigerant port is arranged coaxially with the valve rod receiving port, and is connected to a refrigerant pipe. Moreover, the valve seat which expands in diameter and faces the front-end | tip of a valve stem is provided in the edge part of a 1st refrigerant | coolant port. The valve seat has a resin coating. The second refrigerant port branches from between the valve rod receiving port and the first refrigerant port, and the refrigerant pipe is connected by a flare nut screwed to the open end. The service port is provided coaxially with the second refrigerant port, and communicates the refrigerant flow path and the atmosphere via the valve core.

  The valve stem is screw-moved in the valve stem receiving port to contact and separate from the valve seat, and opens and closes the refrigerant flow path formed between the first refrigerant port and the second refrigerant port.

  The refrigerant on-off valve is connected to the first refrigerant port by brazing a refrigerant pipe led out from the outdoor unit of the air conditioner. Next, the refrigerant pipe of the indoor unit of the air conditioner is connected to the second refrigerant port by the flare nut with the refrigerant flow path closed by the valve rod. Next, evacuation is performed from the service port, and the inside of the refrigerant pipe disposed in the indoor unit is evacuated. Next, the valve stem is turned with a hexagon wrench to open the refrigerant flow path. Thereby, the refrigerant flow path is opened, the first and second refrigerant ports communicate with each other, and the refrigerant flows.

  A tool such as a monkey wrench is used to connect the refrigerant pipe to the second refrigerant port with a flare nut. At this time, if the flare nut is excessively tightened with a tool, the main body portion is distorted, so that a gap is generated between the valve stem and the valve seat, and refrigerant leakage occurs. In the above-described refrigerant on-off valve, since the resin coating is applied to the valve seat, the resin coating can prevent generation of a gap between the valve stem and the valve seat, thereby preventing refrigerant leakage.

JP 2007-247793 A (page 3 to page 4, FIG. 2)

  However, according to the refrigerant open / close valve of the conventional air conditioner, the resin coating of the valve seat for preventing refrigerant leakage is arranged inside the main body. For this reason, there has been a problem that the resin coating is difficult and the cost of the refrigerant on-off valve is increased because a resin material and an adhesive are required. In addition, since it is difficult to firmly adhere the resin to the valve seat, if the resin is peeled and circulated by erosion due to the refrigerant flow, it may cause a failure of the air conditioner. Thereby, there also existed a problem of reducing the reliability of an air conditioner.

  An object of this invention is to provide the refrigerant | coolant on-off valve of the air conditioner which can aim at reduction of cost and improvement of reliability, and its piping connection method.

In order to achieve the above object, the present invention provides:
A valve rod receiving port; a first refrigerant port communicating with the valve rod receiving port and arranged coaxially; a valve seat provided with an enlarged diameter at one end of the first refrigerant port; the valve rod receiving port; A main body part that has a second refrigerant port that branches from between the first refrigerant port and forms a refrigerant flow path between the first refrigerant port and the second refrigerant port;
A valve rod screwed into the valve rod receiving port, the tip of which contacts and separates from the valve seat and opens and closes the refrigerant flow path;
In the pipe connection method for the refrigerant on-off valve of the air conditioner, the tip of the valve rod and the contact surface of the valve seat are formed by inclined surfaces, and the tip of the refrigerant pipe inserted into the first refrigerant port Is flared between the tip of the valve stem and the valve seat.

  According to this configuration, the refrigerant pipe is inserted into the first refrigerant port, and the refrigerant flow path is closed by the screw movement of the valve stem. At this time, the tip of the refrigerant pipe is sandwiched between the tip of the valve stem made of an inclined surface and the valve seat, and the flare portion of the inclined surface is formed by flare processing. Next, the refrigerant pipe is connected to the second refrigerant port using a tool such as a monkey wrench. When distortion occurs in the main body due to excessive tightening with a tool, the flare of the refrigerant pipe sandwiched between the valve stem and the valve seat prevents the gap between the valve stem and the valve seat, thereby preventing refrigerant leakage. The

  Further, the present invention is characterized in that the flare processing is performed when the refrigerant pipe is brazed to the first refrigerant port in the pipe connection method of the refrigerant on-off valve of the air conditioner having the above-described configuration. According to this configuration, the refrigerant pipe is inserted into the first refrigerant port, and the refrigerant pipe is brazed to the open end of the first refrigerant port. At this time, the tip of the refrigerant pipe softened by the brazing heating is flared by the screw movement of the valve stem.

  The present invention is also characterized in that, in the above-structured pipe connection method for the refrigerant on-off valve of the air conditioner, the tip diameter of the valve rod is smaller than the inner diameter of the refrigerant pipe.

The present invention also provides
A valve rod receiving port; a first refrigerant port communicating with the valve rod receiving port and arranged coaxially; a valve seat provided with an enlarged diameter at one end of the first refrigerant port; the valve rod receiving port; A main body part that has a second refrigerant port that branches from between the first refrigerant port and forms a refrigerant flow path between the first refrigerant port and the second refrigerant port;
A valve rod screwed into the valve rod receiving port, the tip of which contacts and separates from the valve seat and opens and closes the refrigerant flow path;
In the refrigerant open / close valve of the air conditioner having the above structure, the contact surfaces of the tip of the valve rod and the valve seat are formed by inclined surfaces.

  According to the present invention, in the refrigerant on-off valve of the air conditioner configured as described above, a tip diameter of the valve rod is smaller than an inner diameter of a refrigerant pipe connected to the first refrigerant port.

  According to the pipe connection method for the refrigerant on-off valve of the air conditioner of the present invention, the tip of the valve stem and the contact surface of the valve seat are formed in an inclined surface, and the tip of the refrigerant pipe inserted into the first refrigerant port is formed. Since the flare is sandwiched between the tip of the valve stem and the valve seat, the occurrence of a gap between the valve stem and the valve seat can be prevented by the flare portion of the refrigerant pipe. Therefore, it is not necessary to apply a resin coating to the valve seat, and the cost can be reduced and the reliability can be improved.

  Further, according to the refrigerant on-off valve of the air conditioner of the present invention, the tip of the valve stem and the contact surface of the valve seat are formed on the inclined surface, so that the tip of the refrigerant pipe is connected when the refrigerant pipe of the first refrigerant port is connected. Flare processing can be performed between the tip of the valve stem and the valve seat. Thereby, generation | occurrence | production of the clearance gap between a valve stem and a valve seat can be prevented by the flare part of refrigerant | coolant piping. Therefore, it is not necessary to apply a resin coating to the valve seat, and the cost can be reduced and the reliability can be improved.

Front sectional drawing which shows the refrigerant | coolant on-off valve of the air conditioner of embodiment of this invention. The exploded view which shows the refrigerant | coolant on-off valve of the air conditioner of embodiment of this invention. Front sectional view showing a state of pipe connection of the first refrigerant port of the refrigerant on-off valve of the air conditioner according to the embodiment of the present invention. Front sectional view showing a state after pipe connection of the first refrigerant port of the refrigerant on-off valve of the air conditioner of the embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front sectional view and an exploded view showing a refrigerant on-off valve of the air conditioner according to the embodiment. The refrigerant on-off valve 1 is a three-way valve and includes a main body 2 and a valve stem 20. The main body 2 has a substantially cross-shaped passage 10 therein, and the valve rod receiving port 3, the first refrigerant port 4, the second refrigerant port 5, and the service port 6 are opened.

  A threaded portion 2d is provided on the inner surface of the valve stem receiving port 3, and a valve stem 20 having a threaded portion 20a at the tip is screwed. The valve stem 20 is provided with a hexagonal hole 20b for inserting a hexagonal wrench on the rear end surface, and is rotated by the hexagonal wrench to move the screw. The tip of the valve stem 20 is formed by an inclined surface 20c that is a conical surface. An O-ring 21 that is in close contact with the inner surface of the valve stem receiving port 3 is disposed on the peripheral surface of the valve stem 20. The open end of the valve stem receiving port 3 into which the valve stem 20 is inserted is closed by screwing a protective cap 13 with a screw portion 2 a provided on the outer surface of the main body portion 2.

  The first refrigerant port 4 is arranged coaxially with the valve rod receiving port 3 and is connected to a refrigerant pipe 25 (see FIG. 3). A valve seat 7 having a diameter expanded by an inclined surface 7a that is a conical surface is provided at an end of the first refrigerant port 4 on the valve rod receiving port 3 side. The valve seat 7 faces the tip of the valve stem 20, and inclined surfaces 7a and 20c that abut against each other by screw movement of the valve stem 20 are formed at the same taper angle α (for example, 90 °, see FIG. 3).

  The second refrigerant port 5 branches from between the valve rod receiving port 3 and the first refrigerant port 4. As a result, a refrigerant flow path 11 through which the refrigerant flows is formed by the passage 10 between the first refrigerant port 4 and the second refrigerant port 5. The valve stem 20 is screw-moved in the valve stem receiving port 3 by screwing of the screw portions 2d and 20a to contact and separate from the valve seat 7 to open and close the refrigerant flow path 11. Refrigerant piping (not shown) is connected to the second refrigerant port 5 by a flare nut 15 screwed by a screw portion 2 b provided on the outer surface of the main body 2.

  The service port 6 is provided coaxially with the second refrigerant port 5 and communicates the refrigerant flow path 11 with the atmosphere via the valve core 8. The open end of the service port 6 is closed by screwing a protective cap 16 with a screw portion 2 c provided on the outer surface of the main body 2.

  When the refrigerant pipe of the refrigerant on-off valve 1 having the above configuration is connected, as shown in FIG. 3, the refrigerant pipe made of a copper pipe or the like led out from the outdoor unit of the air conditioner with the refrigerant flow path 11 opened by the valve rod 20 25 is inserted into the first refrigerant port 4. At this time, the front end of the refrigerant pipe 25 is arranged to protrude into the valve seat 7 from the open end of the first refrigerant port 4.

  Next, the open end of the first refrigerant port 4 and the refrigerant pipe 25 are brazed, and the refrigerant pipe 25 is fixed to the first refrigerant port 4 by the brazing portion 26. At the same time, the valve stem 20 is rotated by a hexagon wrench inserted into the hexagonal hole 20b (see FIG. 2), and as shown by an arrow A, the valve stem 20 is screw-moved toward the valve seat 7. The tip diameter of the valve stem 20 is smaller than the inner diameter of the first refrigerant port 4 and the refrigerant pipe 25, and the tip of the valve stem 20 enters the refrigerant pipe 25 by screw movement.

  When the valve stem 20 is further moved by screws, the tip of the thin refrigerant pipe 25 is sandwiched between the inclined surface 20c of the valve rod 20 and the inclined surface 7a of the valve seat 7 as shown in FIG. Is done. As a result, the refrigerant flow path 11 is closed, and a flare portion 25 a having an inclined surface is formed at the tip of the refrigerant pipe 25. At this time, since the refrigerant pipe 25 is softened by brazing, the flare portion 25a can be easily formed. The flare portion 25a is brought into close contact with the valve stem 20 and the valve seat 7 by plastic deformation to seal between them.

  Next, the refrigerant pipe (not shown) of the indoor unit of the air conditioner is connected to the second refrigerant port 5 by a flare nut 15 using a monkey wrench or the like with the refrigerant flow path 11 closed. Distortion may occur in the main body 2 due to excessive tightening of the flare nut 15 by a tool. At this time, the flare portion 25a of the refrigerant pipe 25 sandwiched between the valve stem 20 and the valve seat 7 prevents the gap between the valve stem 20 and the valve seat 7 from being generated, thereby preventing refrigerant leakage.

  Next, evacuation is performed from the service port 6 through the valve core 8 to evacuate the refrigerant pipe disposed in the indoor unit. Next, the coolant passage 11 is opened by turning the valve stem 20 with a hexagon wrench. Thereby, the refrigerant | coolant flow path 11 is open | released, the 1st, 2nd refrigerant | coolant ports 4 and 5 are connected, and a refrigerant | coolant distribute | circulates. Then, the valve cap receiving port 3 and the service port 6 are closed by the protective caps 13 and 16.

  According to this embodiment, the tip of the valve stem 20 and the contact surface of the valve seat 7 are formed on the inclined surfaces 20c and 7a, so that the tip of the refrigerant pipe 25 is connected when the refrigerant pipe 25 of the first refrigerant port 4 is connected. Flare processing can be performed between the tip of the valve stem 20 and the valve seat 7. Thereby, generation | occurrence | production of the clearance gap between the valve rod 20 and the valve seat 7 can be prevented with the flare part 25a of the refrigerant | coolant piping 25. FIG. Therefore, it is not necessary to apply a resin coating to the valve seat 7, and costs can be reduced and reliability can be improved.

  Moreover, since the flare processing of the tip is performed when the refrigerant pipe 25 is brazed to the first refrigerant port 4, the refrigerant pipe 25 is softened by the brazing heating, and the flare portion 25a is easily moved by the screw movement of the valve stem 20. Can be formed.

  Further, since the tip diameter of the valve rod 20 is smaller than the inner diameter of the refrigerant pipe 25 connected to the first refrigerant port 4, the inclined surface 20c of the valve rod 20 that is screw-moved is inserted into the refrigerant pipe 25, so that flare easily The portion 25a can be formed.

  In the present embodiment, the refrigerant on-off valve 1 is constituted by a three-way valve, but may be a two-way valve in which the valve core 8 is omitted and the service port 6 is closed.

  According to the present invention, it can be used for an air conditioner including a refrigerant on-off valve such as a two-way valve or a three-way valve.

DESCRIPTION OF SYMBOLS 1 Refrigerant on-off valve 2 Main-body part 3 Valve rod receiving port 4 1st refrigerant | coolant port 5 2nd refrigerant | coolant port 6 Service port 7 Valve seat 7a Inclined surface 8 Valve core 10 Passage 11 Refrigerant flow path 13, 16 Protective cap 15 Flare nut 20 Valve rod 20c Inclined surface 21 O-ring 25 Refrigerant piping 25a Flare part 26 Brazing part

Claims (5)

A valve rod receiving port; a first refrigerant port communicating with the valve rod receiving port and arranged coaxially; a valve seat provided with an enlarged diameter at one end of the first refrigerant port; the valve rod receiving port; A main body part that has a second refrigerant port that branches from between the first refrigerant port and forms a refrigerant flow path between the first refrigerant port and the second refrigerant port;
A valve rod screwed into the valve rod receiving port, the tip of which contacts and separates from the valve seat and opens and closes the refrigerant flow path;
In the pipe connection method for the refrigerant on-off valve of the air conditioner, the tip of the valve rod and the contact surface of the valve seat are formed by inclined surfaces, and the tip of the refrigerant pipe inserted into the first refrigerant port Is connected to the front end of the valve stem and the valve seat, and is flared.   The method for connecting pipes for a refrigerant on-off valve of an air conditioner according to claim 1, wherein the flare processing is performed when the refrigerant pipe is brazed to the first refrigerant port.   The pipe connection method of the refrigerant on-off valve of the air conditioner according to claim 1 or 2, wherein a tip diameter of the valve rod is smaller than an inner diameter of the refrigerant pipe. A valve rod receiving port; a first refrigerant port communicating with the valve rod receiving port and arranged coaxially; a valve seat provided with an enlarged diameter at one end of the first refrigerant port; the valve rod receiving port; A main body part that has a second refrigerant port that branches from between the first refrigerant port and forms a refrigerant flow path between the first refrigerant port and the second refrigerant port;
A valve rod screwed into the valve rod receiving port, the tip of which contacts and separates from the valve seat and opens and closes the refrigerant flow path;
A refrigerant on-off valve for an air conditioner comprising: an air conditioner refrigerant on-off valve, wherein a tip end of the valve stem and a contact surface of the valve seat are formed by inclined surfaces.   The refrigerant on-off valve for an air conditioner according to claim 4, wherein a tip diameter of the valve rod is smaller than an inner diameter of a refrigerant pipe connected to the first refrigerant port.

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